Oh no. It does nothing of the sort. Of course indices are different according to the total number of decks -- but not with remaining decks. If you start with four decks and have one left, the one left is still based on four decks.
Example, what are the odds of getting a BJ? It's the odds of getting an ace then a ten plus the odds of getting a ten and an ace since either is a natural.
Single-deck (52 cards, 4 aces and 16 tens): (4/52 * 16/51) + (16/52 * 4/51) = 0.04826546003
Double-deck (104 cards, 8 aces and 32 tens): (8/104 * 32/103) + (32/104 * 8/103) = 0.04779686333
Simple combinations. That's true at the start, middle, or end of the pile of cards.
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